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Well, the chances are you might have actually put on some weight during this challenge because while you might have burned some fat, you definitely built some muscles and muscles are actually 20% denser (heavier) than fat :) That´s why muscular people are heavier than fat people (at the same volume).

Oh no! In that case it's good that I can't remember how much I weighed before !!

With your tiny and slim physique, you don´t really need to be afraid of the scale ;)